Fix log4j pattern layout

[lonre]

What is the purpose of the change

Fix log4j pattern layout

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #2802 into master will increase coverage by 1%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #2802     +/-   ##
========================================
+ Coverage   62.49%   63.5%     +1%     
========================================
  Files         599     577     -22     
  Lines       27918   25929   -1989     
  Branches     4829    4541    -288     
========================================
- Hits        17447   16465    -982     
+ Misses       8210    7309    -901     
+ Partials     2261    2155    -106

Impacted Files	Coverage Δ
.../remoting/transport/netty4/NettyClientHandler.java	75% <0%> (-13.89%)	⬇️
...ache/dubbo/remoting/transport/AbstractChannel.java	75% <0%> (-12.5%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	39.47% <0%> (-10.53%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0%> (-8.7%)	⬇️
...ubbo/rpc/protocol/dubbo/ChannelWrappedInvoker.java	41.66% <0%> (-8.34%)	⬇️
...onfig/spring/extension/SpringExtensionFactory.java	78.94% <0%> (-5.27%)	⬇️
.../dubbo/remoting/transport/netty4/NettyChannel.java	61.17% <0%> (-4.71%)	⬇️
...e/dubbo/registry/integration/RegistryProtocol.java	81.25% <0%> (-1.93%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	80.22% <0%> (-1.87%)	⬇️
.../src/main/java/org/apache/dubbo/rpc/RpcStatus.java	57.89% <0%> (-1.06%)	⬇️
... and 24 more

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[ralf0131]

Looks good to me!
I'll be appreciated if you can change the date format from dd/MM/yy to yyyy-MM-dd or dd/MM/yyyy, which is easier to read.
I will merge this pull request anyway.